What are the benefits of upgrading a Stronghold?

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Early in the game, you unlock Strongholds, in which you can build various projects in order to gain benefits (such as refueling and rearming when visiting the base, or additional scrap when you destroy cars).
In Gutgash's Stronghold (and probably others), there is also the option to make a small / medium stockpile, which makes the Stronghold "better" for the cost of 500/1000.
How is the stronghold made better by adding these piles of scrap, or is it simply cosmetic?
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What does improving strongholds do Mad Max?
Unlimited Gas, replenishes health, refils water, Automatically collects scrap from destroyed cars, and knowing where all scavaging locations are.How important is the Stronghold in Lost Ark?
Crafting is the big draw of Lost Ark's Stronghold, as it gives you a way to acquire powerful items without dropping much cash. You can also build or craft a variety of items that grant you passive attribute boosts, which can be particularly useful to high-level players.How Minecraft's Stronghold SHOULD Be Updated
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Images: Ann H, Brett Jordan, Anna Tarazevich, Pixabay